Biology: Some dogs bark while others are silent when trailing prey. The barking characteristic is due to a dom?

1.) In guinea pigs, black coat colour is dominant to white. What is the probability that a heterozygous black guinea pig crossed with a white one will produce a white offspring?

~75%

~50%

~25%

~100%

2.) In guinea pigs, black coat colour is dominant to white. What is the predicted ratio of black to white offspring from this cross?

~1/1

~3/4

~1/2

~1/4

3.) Some dogs bark while others are silent when trailing prey. The barking characteristic is due to a dominant gene (B). Erect ears (E) are dominant to drooping ears (e).

If you crossed a dog heterozygous for both traits with a droopy-eared, silent trailer, what are the chances that one of their offspring will be dominant for both traits (erect-eared, barking trailer)? (show Punnett Square work)

4.) What are the chances of these two dogs producing a droopy-eared, silent trailer?

~3 in 4

~1 in 4

~1 in 2

~3 in 16

5.) If two dogs heterozygous for both traits were crossed, what would be the chance of them producing a droopy-eared, silent trailer?

~1 in 4

~3 in 16

~1 in 16

~3 in 4